220kV变电站电晕噪声抑制技术研究和应用

变电站电晕放电会导致变电站工频电磁场及无线电干扰水平超标，对周围环境造成噪音和电磁污染，影响居民生活和工程的环境评价，因此必须对其进行治理。根据相关设备、金具的实际布置形式和外形结构图纸，结合变电站电晕实测结果，同时考虑相间影响和周围带电导体作用，采用有限元软件ANSYS建立了220 kV变电站典型放电位置的三维电场有限元仿真计算模型，计算了金具表面的电场分布，得到了其表面的场强最大值和分布规律。根据计算结果优化了金具的结构、尺寸和参数，并提出了电晕噪声抑制措施。仿真结果表明采取优化和抑制措施后，金具的电场分布畸变有较大改善，表面最大场强下降到3 000 V/mm以下。研究成果为变电站的防晕降噪设计提供了重要参考，为绿色电网和变电站的建设提供了依据。

Research and Application of Corona Noise Suppression Technology for 220kV Substation

Residents`living condition and project environment evaluation are affected greatly by noise and electromagnetic pollution caused by substation corna discharge, which must be suppressed.According to the actual layout and structural drawings of related equipment and fittings, taking measured results of substation corna discharge as reference, and considering the effects of three phases and surrounding conductors, an electric field finite element simulation model for 220kV substations typical discharge positions is built by the finite element method ( FEM ) software ANSYS.The maximum surface electric field magnitudes of the fittings are calculated, the surface electric field distribution conditions are obtained, the structure of those corona fittings is optimized based on the calculation results and corona noise suppression measures are put forward.The results show that after structure optimization, the distortion of electric field distribution of the fittings is declined greatly, and the maximum surface electric field magnitudes are reduced to less than 3000V/mm.This research provides important reference for prevention of corona and reduction of substation noise, and supplies basis for construction of green grid and substation.